export function downloadFileFunction(res, outputFileName) {
  let blob = new Blob([res], {
    type: 'application/octet-stream'
  })
  let downloadElement = document.createElement('a');
  let href = window.URL.createObjectURL(blob); //创建下载的链接
  downloadElement.href = href;
  downloadElement.download = outputFileName; //下载后文件名
  document.body.appendChild(downloadElement);
  downloadElement.click(); //点击下载
  document.body.removeChild(downloadElement); //下载完成移除元素
  window.URL.revokeObjectURL(href); //释放掉blob对象
}
